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7.17 ATAN2 ¡ª Arctangent function Description: ATAN2(Y,X) computes the arctangent of the complex number X + i Y. Option: f95, gnu Class: elemental function Syntax: X = ATAN2(Y,X) Arguments: Y The type shall be REAL(*). X The type and kind type parameter shall be the same as Y. If Y is zero, then X must be nonzero. Return value: The return value has the same type and kind type parameter as Y. It is the principle value of the complex number X + i Y. If X is nonzero, then it lies in the range -\pi \le \arccos (x) \leq \pi. The sign is positive if Y is positive. If Y is zero, then the return value is zero if X is positive and \pi if X is negative. Finally, if X is zero, then the magnitude of the result is \pi/2. Example: program test_atan2 real(4) :: x = 1.e0_4, y = 0.5e0_4 x = atan2(y,x) end program test_atan2 Specific names: Name Argument Return type Option DATAN2(X) REAL(8) X REAL(8) f95, gnu ÄãµÄ£Ã£Á£Ò£ÇÓ¦¸ÃÊDZðµÄ¿âÀïµÄ£¬ÄãµÃ×Ô¼ºÕÒ³öÎÊÌâÔÚÄÄŶ¡£ ÓÃatan2ÊÔÊÔ°Éf95±ê×¼º¯Êý |
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